// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/views/controls/scrollbar/native_scroll_bar.h"

#include <algorithm>
#include <string>

#include "base/message_loop/message_loop.h"
#include "ui/events/event.h"
#include "ui/views/controls/scrollbar/native_scroll_bar_views.h"
#include "ui/views/controls/scrollbar/native_scroll_bar_wrapper.h"
#include "ui/views/widget/widget.h"

namespace views {

// static
const char NativeScrollBar::kViewClassName[] = "NativeScrollBar";

////////////////////////////////////////////////////////////////////////////////
// NativeScrollBar, public:
NativeScrollBar::NativeScrollBar(bool is_horizontal)
    : ScrollBar(is_horizontal)
    , native_wrapper_(NULL)
{
}

NativeScrollBar::~NativeScrollBar()
{
}

// static
int NativeScrollBar::GetHorizontalScrollBarHeight(
    const ui::NativeTheme* theme)
{
    return NativeScrollBarWrapper::GetHorizontalScrollBarHeight(theme);
}

// static
int NativeScrollBar::GetVerticalScrollBarWidth(
    const ui::NativeTheme* theme)
{
    return NativeScrollBarWrapper::GetVerticalScrollBarWidth(theme);
}

////////////////////////////////////////////////////////////////////////////////
// NativeScrollBar, View overrides:
gfx::Size NativeScrollBar::GetPreferredSize() const
{
    if (native_wrapper_)
        return native_wrapper_->GetView()->GetPreferredSize();
    return gfx::Size();
}

void NativeScrollBar::Layout()
{
    if (native_wrapper_) {
        native_wrapper_->GetView()->SetBounds(0, 0, width(), height());
        native_wrapper_->GetView()->Layout();
    }
}

void NativeScrollBar::ViewHierarchyChanged(
    const ViewHierarchyChangedDetails& details)
{
    if (details.is_add && !native_wrapper_ && GetWidget()) {
        native_wrapper_ = NativeScrollBarWrapper::CreateWrapper(this);
        AddChildView(native_wrapper_->GetView());
    }
}

const char* NativeScrollBar::GetClassName() const
{
    return kViewClassName;
}

// Overridden from View for keyboard UI.
bool NativeScrollBar::OnKeyPressed(const ui::KeyEvent& event)
{
    if (!native_wrapper_)
        return false;
    return native_wrapper_->GetView()->OnKeyPressed(event);
}

void NativeScrollBar::OnGestureEvent(ui::GestureEvent* event)
{
    if (!native_wrapper_)
        return;
    native_wrapper_->GetView()->OnGestureEvent(event);
}

bool NativeScrollBar::OnMouseWheel(const ui::MouseWheelEvent& event)
{
    if (!native_wrapper_)
        return false;
    return native_wrapper_->GetView()->OnMouseWheel(event);
}

////////////////////////////////////////////////////////////////////////////////
// NativeScrollBar, ScrollBar overrides:
void NativeScrollBar::Update(int viewport_size,
    int content_size,
    int current_pos)
{
    ScrollBar::Update(viewport_size, content_size, current_pos);

    if (native_wrapper_)
        native_wrapper_->Update(viewport_size, content_size, current_pos);
}

int NativeScrollBar::GetLayoutSize() const
{
    return IsHorizontal() ? GetHorizontalScrollBarHeight(GetNativeTheme()) : GetVerticalScrollBarWidth(GetNativeTheme());
}

int NativeScrollBar::GetPosition() const
{
    if (!native_wrapper_)
        return 0;
    return native_wrapper_->GetPosition();
}

} // namespace views
